EP1500230B1 - Vorbenachrichtigung von möglichen verlust der verbindung in einem drahtloses locales netzwerk - Google Patents

Vorbenachrichtigung von möglichen verlust der verbindung in einem drahtloses locales netzwerk Download PDF

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Publication number
EP1500230B1
EP1500230B1 EP03718489A EP03718489A EP1500230B1 EP 1500230 B1 EP1500230 B1 EP 1500230B1 EP 03718489 A EP03718489 A EP 03718489A EP 03718489 A EP03718489 A EP 03718489A EP 1500230 B1 EP1500230 B1 EP 1500230B1
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EP
European Patent Office
Prior art keywords
signal strength
wireless
user device
user
threshold
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EP03718489A
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English (en)
French (fr)
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EP1500230A1 (de
Inventor
Lynn Comp
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Intel Corp
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Intel Corp
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W40/00—Communication routing or communication path finding
    • H04W40/24—Connectivity information management, e.g. connectivity discovery or connectivity update
    • H04W40/248—Connectivity information update
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/309—Measuring or estimating channel quality parameters
    • H04B17/318—Received signal strength
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/005—Discovery of network devices, e.g. terminals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/20—Monitoring; Testing of receivers
    • H04B17/23—Indication means, e.g. displays, alarms, audible means

Definitions

  • Wireless local area networks are becoming increasingly popular as a means to avoid the costs and inconveniences often associated with wired network connections.
  • one or more wireless access points APs
  • LAN local area network
  • user devices Although other WLAN arrangements also exist.
  • APs wireless access points
  • LAN local area network
  • the user device Once a wireless link has been established between a user device and an AP, the user device will often be able to operate in substantially the same fashion as it would if it had a wired connection to the network.
  • User devices that are coupled to a network through a wireless link enjoy a degree ofportability that is not possible in a fully wired network.
  • the user device may be carried about by the user (e.g., from the user's office to a nearby conference room, etc.) without losing the connection to the network.
  • the user device may be moved too far from the corresponding AP, the network connection will be lost. If this occurs, any open applications on the user device that are using the network connection may crash, potentially resulting in a loss of data and/or other valuable information.
  • Document EP-A-0 693 861 discloses a TDMA network that can preliminary inform a user of the possibility of an occurence of interruption of a call.
  • Fig. 1 is a block diagram illustrating a wireless local area network (WLAN) topology 10 in accordance with an embodiment of the present invention.
  • WLAN wireless local area network
  • a wireless access point 14 provides access to a wired LAN 12 for one or more user devices 16, 18, 20.
  • one or more additional access points may also be coupled to the wired LAN 12 to provide wireless access for additional user devices.
  • the wired LAN 12 may include, for example, one or more servers for providing client/server functions within the network 10.
  • the wired LAN 12 may also include functionality for providing a connection to another network (e.g., the Internet, a wide area network (WAN), etc.).
  • another network e.g., the Internet, a wide area network (WAN), etc.
  • the user devices 16, 18, 20 may include any of a wide variety of different digital data handling devices including, for example, laptop, palmtop, and/or desktop computers; personal digital assistants (PDA); pagers; and/or others.
  • PDA personal digital assistants
  • the number of user devices that can be supported by a single access point 14 may vary from system to system.
  • the user devices 16, 18, 20 each include wireless transceiver functionality that is capable of establishing and maintaining a wireless communication link with a corresponding access point 14.
  • the wireless transceiver functionality will often comply with one or more wireless networking standards or technologies.
  • Some common wireless networking standards/technologies include, for example: IEEE 802.11a, b, g, HomeRF, HiperLAN, Ultrawideband, Bluetooth, wireless asynchronous transfer mode (WATM), digital enhanced cordless telecommunications (DECT), Wireless Universal Serial Bus (USB), Wireless IEEE 1394, and others.
  • One or more of the user devices 16,18, 20 may include a wireless network interface card (NIC) (e.g., an 802.11b NIC, etc.) that is installed within an appropriate input/output port of the device.
  • NIC wireless network interface card
  • one or more of the user devices 16, 18, 20 may include wireless network components that are directly integrated within the device (i.e., without using an add-on card or board).
  • An antenna or other radiating device or transducer will also typically be provided within a user device.
  • radio frequency (RF) energy is used to provide wireless communication between each user device and a corresponding access point.
  • RF radio frequency
  • the wireless access point 14 will typically have a limited range within which reliable communication with user devices can be supported. Thus, as a user device moves away from the access point 14 (e.g., as a user walks to a meeting with his/her laptop computer), a point may eventually be reached where the network connection is lost. In such an event, any applications that are currently running on the user device (or on a remote server) that are relying on the network connection (e.g., email programs, Internet browsers, etc.) may crash.
  • any applications that are currently running on the user device (or on a remote server) that are relying on the network connection e.g., email programs, Internet browsers, etc.
  • Such crashes can result in a loss of valuable information and/or work product and may also require additional efforts to be made to return a corresponding user device to an operative and usable state (e.g., the Microsoft Windows ® operating system may require a user to press control-alt-delete in an effort to close a program that is not responding). It was determined that many of the potential problems associated with the loss of a wireless network connection could be avoided if a corresponding user had notification of a potential connection loss before an actual loss has occurred. Such notification allows the user to take appropriate protective action when an increased likelihood of connection loss exists.
  • Fig. 2 is a block diagram illustrating user notification equipment 22 for use in association with a wireless user device in accordance with an embodiment of the present invention.
  • the user notification equipment 22 includes a connection loss likelihood monitor 24 and an enunciator 26.
  • the connection loss likelihood monitor 24 is operative for determining whether there is an elevated likelihood that a user device will lose a wireless network connection.
  • the enunciator 26 is used to notify a user associated with the user device so that the user can take appropriate action.
  • the enunciator 26 may include any form of device that is capable of providing this notice to a user, including visual devices, audio devices, and/or audio/visual devices. Multiple enunciators 26 may also be used.
  • both the connection loss likelihood monitor 24 and the enunciator 26 are located with the corresponding user device.
  • the connection loss likelihood monitor 24 and the enunciator 26 may both be part of a network interface card installed within the user device.
  • the connection loss likelihood monitor 24 and the enunciator 26 may both be directly integrated into the user device.
  • one of the functions may be part of a NIC and the other directly integrated within the device.
  • the enunciator 26 can also be externally coupled to the user device (e.g., as an external display and/or loudspeaker). Multiple enunciators 26 may also be provided that are each either part of a NIC, directly integrated, or externally connected to the user device. Other arrangements are also possible.
  • the connection loss likelihood monitor 24 is located at a remote location (e.g., within a network access point) and the enunciator 26 is located with the user device.
  • the connection loss likelihood monitor 24 makes a connection loss determination based on input information relating to the wireless channel supporting the network connection.
  • the connection loss likelihood monitor 24 receives information relating to one or more signal levels associated with the wireless channel (e.g., a receive signal level within the user device and/or an access point). If the signal level is below a threshold value, the monitor 24 may determine that there is an elevated likelihood of losing the network connection.
  • the connection loss likelihood monitor 24 receives information relating to the rate at which a signal level associated with the wireless channel is changing (or the monitor 24 may calculate this rate information based on the signal level information discussed above).
  • connection loss likelihood monitor 24 may determine that there is an elevated likelihood of losing the network connection.
  • the connection loss likelihood monitor 24 receives error rate information associated with the wireless channel (e.g., a receive bit error rate of the user device or the access point). If the error rate is higher than a predetermined threshold, the connection loss likelihood monitor 24 may determine that there is an elevated likelihood of losing the network connection.
  • error rate information associated with the wireless channel (e.g., a receive bit error rate of the user device or the access point). If the error rate is higher than a predetermined threshold, the connection loss likelihood monitor 24 may determine that there is an elevated likelihood of losing the network connection.
  • Other techniques for making the connection loss determination, as well as combinations of techniques, may alternatively be used.
  • the enunciator 26 is used to notify a user of a potential loss of network connection before the loss of connection occurs so that the user may take appropriate action.
  • the enunciator 26 may include any form of device that is capable of providing notice to a user, whether visual, audible, or both.
  • the enunciator 26 may include an indicator on an external surface of the user device, a user display associated with the user device, a speaker associated with the user device, etc. Combinations of such structures may also be used.
  • Fig. 3 is a block diagram illustrating a wireless LAN arrangement 28 in accordance with an embodiment of the present invention.
  • the wireless LAN arrangement 28 includes a wireless access point 30, at least one user device 32, and a wired LAN 40.
  • the wireless access point 30 provides access to the wired LAN 40 (or another network structure) for the user device 32.
  • the user device 32 communicates with the wireless access point 30 via a wireless communication channel 36.
  • the wireless access point 30 includes: an antenna 42, a transceiver 44, a signal strength monitor 46, and a controller 48.
  • the user device 32 includes: a wireless NIC 34, a host 38, a display 58, and a speaker 60.
  • the wireless NIC 34 includes: an antenna 50, a transceiver 52, an indicator 54, and a controller 56.
  • the wireless NIC 34 may be removably coupled to the host 38 at an input/output (I/O) port thereof (e.g., an expansion slot or PCMCIA slot).
  • I/O input/output
  • the functionality of the wireless NIC 34 may be made an integral part of the user device 32 (i.e., implemented within the device 32 and not as an add-on card or board). It should be appreciated that the individual blocks illustrated in Fig. 3 (and in other block diagrams herein) are functional in nature and do not necessarily represent discrete hardware elements.
  • two or more of the functional blocks are implemented in software within a common digital processing device (e.g., a general purpose microprocessor, a digital signal processor (DSP), a reduced instruction set computer (RISC), a complex instruction set computer (CISC), a field programmable gate array (FPGA), an application specific integrated circuit (ASIC), or others).
  • a common digital processing device e.g., a general purpose microprocessor, a digital signal processor (DSP), a reduced instruction set computer (RISC), a complex instruction set computer (CISC), a field programmable gate array (FPGA), an application specific integrated circuit (ASIC), or others.
  • DSP digital signal processor
  • RISC reduced instruction set computer
  • CISC complex instruction set computer
  • FPGA field programmable gate array
  • ASIC application specific integrated circuit
  • the transceiver 52 within the NIC 34 is operative for performing conventional RF receiver and transmitter functions for the user device 32. That is, during a transmit operation, the transceiver 52 will convert baseband information from the controller 56 into an RF transmit signal for delivery into the wireless channel 36 via antenna 50. During a receive operation, the transceiver 52 will process an RF signal received from the wireless channel 36 by antenna 50 to exact baseband information therefrom. Although illustrated as a single unit, the transceiver 52 may be implemented as separate transmitter and receiver units. Appropriate duplexer functionality may also be provided to allow the transmit and receive functions to share a common antenna 50. In an alternative approach, separate transmit and receive antennas are provided within the wireless NIC 34.
  • the transceiver 44 within the wireless access point 30 is similar in function to the transceiver 52 of the NIC 34 described above.
  • the transceiver 44 includes multiple independent transmit/receive channels to support simultaneous wireless communication with multiple remote user devices.
  • Multiple signal strength monitors 46 may also be provided within the access point 30 to simultaneously monitor receive signal strength for multiple remote user devices.
  • the antennas 42, 50 described above may be replaced by appropriate transducer structures.
  • the controller 56 within the NIC 34 provides, among other things, an interface between the transceiver 52 and the host 38. As will be described in greater detail, the controller 56 also acts as a connection loss likelihood monitor to provide notice to a user of the user device 32 when there is a potential loss of network connectivity (although a separate controller may alternatively be used to provide this functionality).
  • the indicator 54 is mounted on an external portion of the wireless NIC 34 to provide a visible and controllable indication to the user of a present condition of the wireless channel 36.
  • the controller 48 within the wireless access point 30 provides, among other things, an interface between the transceiver 44 and the wired LAN 40.
  • the signal strength monitor 46 is operative for monitoring the strength of signals received by the access point 30 from the user device 32 through the wireless channel 36.
  • the signal strength monitor 46 delivers the resulting signal strength information (or a portion thereof) to the controller 48 which may use the information to generate one or more signal strength messages for delivery to the user device 32 (e.g., via wireless channel 36).
  • the controller 56 within the user device 32 may then use the corresponding signal strength information to determine whether the user of the device 32 should be notified of a potential loss of connection.
  • the controller 48 within the access point 30 automatically delivers signal strength messages to the user device 32 (e.g., at regular intervals).
  • the controller 56 within the NIC 34 sends a signal strength request message to the access point 30 when signal strength information is desired and the controller 48 within the access point 30 sends a signal strength response message to the user device 32 in response thereto.
  • the controller 56 may deliver signal strength request messages to the access point 30 at regular intervals in order to obtain continuously updated signal strength information.
  • the controller 56 causes a signal strength request message to be delivered to the access point 30 every 100-300 milliseconds.
  • the controller 56 may use the information to generate an appropriate indication on the (optional) indicator 54.
  • a user associated with the user device 32 may then view the indicator 54 while a network connection is active to determine a current status and/or reliability of the connection. The user may then take appropriate action if the indicator 54 indicates that a loss of connection may be imminent.
  • the indicator 54 includes three light emitting diodes (LEDs) having different colors (e.g., green, yellow, and red).
  • the controller 56 may cause a first of the LEDs within the indicator 54 to be illuminated (e.g., the green LED). If the signal strength information indicates that the signal strength is within a lower range (e.g., between 40% and 70% of nominal power), the controller 56 may cause a second of the LEDs to be illuminated (e.g., the yellow LED). If the signal strength information indicates that the signal strength is within an even lower range (e.g., ⁇ 40% of nominal power), the controller 56 may cause a third of the LEDs to be illuminated (e.g., the red LED).
  • a desirable range for supporting a wireless link e.g., ⁇ 70% of nominal power
  • the indicator 54 includes a single LED that is illuminated whenever the signal strength is determined to be below a threshold value.
  • the indicator 54 includes a series of LEDs (e.g.,10 adjacent LEDs) that are set up as a signal level meter. That is, the number of LEDs that are illuminated at a particular time is proportional to the latest signal strength indication received by the controller 56. Electro-mechanical meters (e.g., d'Arsenval-type meter movements, etc.) may similarly be used. As will be appreciated, many other indicator types may alternatively be used in accordance with the present invention.
  • the NIC 34 may use the display 58 associated with the host 38 to provide notification to the user of a potential loss of network connectivity.
  • the controller 56 delivers an alert message to the display 58 when it is determined that an increased likelihood of connection loss exists (e.g., when the signal strength is found to be within a predetermined range).
  • the controller 56 may make use of, for example, the application programming interface (API) of the operating system of the host 38 to generate the appropriate alert message.
  • the alert message may be as simple as an on-screen warning that the present network connection is unreliable.
  • the alert message may also include a suggestion for the user to save all work from and close all applications that are presently using the network connection.
  • the controller 56 causes a list of possible response options to be displayed to the user on the display 58 (e.g., within a dialog box) when an increased likelihood of connection loss is detected.
  • the list may include, for example, any one or more of the following response options: (1) to save all work from and close one or more presently open applications, (2) to save the application state of one or more presently open applications to cache, (3) to initiate a search for an alternate access point that is capable of supporting a network connection for the user device, (4) to change the position of the user device to a location that is closer to the corresponding access point, and (5) to close the alert box without taking any action.
  • the list may be displayed in front of all other applications on the display 58 and may only be removed by an appropriate response from the user.
  • other forms of alert message may alternatively be used.
  • the controller 56 may be programmed to automatically take preventive action. For example, the controller 56 may automatically store the application state of some or all of the relevant applications to cache. An appropriate message may also be displayed to the user on the display 58.
  • the controller 56 may also utilize the speaker 60 associated with the host 38 to notify the user of a potential network connection loss.
  • the NIC 34 causes an audible tone to be emitted from the speaker 60 when the signal strength is determined to be within a predetermined range.
  • a computer generated or digitized voice message may be emitted from the speaker 60.
  • the voice message may state, for example, "You are at risk of losing your network connection. Please take appropriate action.”
  • audible response options are presented to the user through the speaker 60. The user may then select an appropriate response option using an input device such as, for example, a keyboard, a touch screen, a mouse, a microphone (should speech recognition functionality be available), and/or others.
  • the audible notification provided through the speaker 60 can be used in addition to, or as an alternative to, the visual notification provided by the display 58 and/or the indicator 54.
  • An audible indication may be valuable when, for example, the user is near the user device 32 but is not presently monitoring the display 58 or the indicator 54 (e.g., when the user is carrying the user device to a meeting, etc.).
  • the controller 56 within the NIC 34 obtains signal strength information from the wireless access point 30 and uses the information to determine whether to notify a user of the user device 32 of a potential loss of network connection.
  • the decision on whether to provide notification to the user is made within the wireless access point 30, rather than in the user device 32 (e.g., based on the output of the signal strength monitor 46). Then, if it is determined that notification is to be given, the wireless access point 30 transmits an instruction to the user device 32 to provide such notification.
  • the controller 56 within the NIC 34 may then provide the notification to the user using one or more of the techniques described above.
  • Fig. 4 is a block diagram illustrating a wireless LAN arrangement 70 in accordance with another embodiment of the present invention.
  • a wireless access point 72 provides access to a wired LAN 40 (or similar network structure) for at least one user device 74.
  • the user device 74 includes: a wireless NIC 76, a host 38, a display 58, and a speaker 60.
  • the wireless LAN arrangement 70 of Fig. 4 is similar to the arrangement 28 of Fig. 3 , except that the signal strength monitor 46 has been moved to the NIC 76 of the user device 74.
  • the signal strength monitor 46 monitors the strength of signals received from the wireless access point 72 through the wireless channel 36.
  • the signal strength monitor 46 delivers signal strength information to the controller 56 which uses the information to determine whether the user needs to be notified of a potential loss of network connection.
  • the notification can be performed as previously described using the indicator 54, the display 58, and/or the speaker 60.
  • signal strength monitors 46 are provided within both a wireless access point and the corresponding user device. Notification may then be given to a user if the signal strength detected by either of the monitors indicates a potential loss of network connection.
  • the above-described user notification techniques are implemented within a system that also uses transmit power control to support a wireless link between a network access point and a user device.
  • Power control typically involves the adjustment of the transmit power of a device based on the signal level of a signal received from the device by another device.
  • the transmit power of the user device 16 may be reduced when a stronger than necessary signal is being received by the access point 14 (e.g., to conserve energy within the user device 16).
  • the transmit power of the user device 16 may be increased when the signal being received by the access point 14 is weak (e.g., to increase the quality of the wireless connection). Even when power control is being implemented, a loss of network connection is still possible.
  • the user notification techniques described above can be advantageously used within such a system.
  • Fig. 5 is a flowchart illustrating a method 80 for providing notification of a potential loss of a wireless network connection to a user in accordance with an embodiment of the present invention.
  • signal strength information is obtained that relates to a wireless communication link supporting the wireless network connection (block 82). It is next determined whether the signal strength indicated by the signal strength information is greater than a first threshold value (block 84). If the signal strength is greater than the first threshold value, a visual indication of such (e.g., the illumination of a green LED or similar indicator, etc.) may be provided to the user (block 86). The method 80 may then return to block 82. If the signal strength is not greater than the first threshold value, it is next determined whether the signal strength is greater than a second threshold value (block 88).
  • the second threshold value is lower than the first threshold value. If the signal strength is greater than the second threshold value, but less than the first threshold value, a corresponding visual indication (e.g., the illumination of a yellow LED or similar indicator, etc.) may be provided to the user (block 90). An audible indication may also be provided to the user (block 92). In addition (or in the alternative), an on-screen warning of a potential connection loss may be provided to the user (block 94). Any one or more of these notification techniques may be used. The on-screen warning may include a list of possible response options that may be undertaken by the user. The method 80 may then return to block 82.
  • a corresponding visual indication e.g., the illumination of a yellow LED or similar indicator, etc.
  • An audible indication may also be provided to the user (block 92).
  • an on-screen warning of a potential connection loss may be provided to the user (block 94). Any one or more of these notification techniques may be used.
  • the on-screen warning may include a list
  • a corresponding visual indication (e.g., the illumination of a red LED or similar indicator, etc.) may be provided to the user (block 96).
  • the application state of one or more applications being executed on the user device may then be automatically stored in cache (block 98).
  • An on-screen message may also be generated on a display device to notify the user of the present status of the wireless network connection (block 100).
  • the on-screen message may also inform the user that one or more application states have been stored in cache.
  • An on-screen list of possible response strategies may also be provided at this point. The method 80 may then return to block 82.
  • signal strength information is obtained, and the above-described method 80 is repeated, at regular intervals (e.g., every 100-300 milliseconds).
  • the user may also be given the ability to modify the update interval based on his/her individual needs (e.g., if the user rarely moves the user device, the update interval can be increased or the notification feature can be deactivated).
  • many modifications may be made to the method 80 of Fig. 5 .
  • only a single threshold value is used. If the signal strength is below the single threshold value, notification of potential connection loss may be provided to the user as described above (e.g., block 90, block 92, and/or block 94).
  • One or more automatic response actions may also be performed (e.g., block 98).
  • Other modifications to the method 80 are also possible.

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
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Claims (35)

  1. Drahtloses lokales Netzwerk (10), das Folgendes umfasst:
    einen drahtlosen Zugangspunkt (14), der an ein drahtgebundenes lokales Netzwerk (12) gekoppelt ist;
    mindestens ein Benutzergerät (16, 18, 20), das einen drahtlosen Kommunikationskanal zum drahtlosen Zugangspunkt (14) aufweist;
    ein Kontrollgerät (24) für die Wahrscheinlichkeit eines Verlusts der Verbindung zum Bestimmen, ob eine hohe Wahrscheinlichkeit besteht, dass ein Benutzergerät (16, 18, 20) eine drahtlose Netzwerkverbindung verliert, wenn bestimmt wird, dass eine der drahtlosen Verbindung zugehörige Signalstärke unterhalb einer ersten Schwelle liegt;
    einen Verkünder (26), der ortsgleich mit dem Benutzergerät (16, 18, 20) ist, zum Benachrichtigen eines Benutzers, wenn das Kontrollgerät für die Wahrscheinlichkeit eines Verlusts der Verbindung bestimmt, dass eine hohe Wahrscheinlichkeit des Verlusts der drahtlosen Netzwerkverbindung besteht; dadurch gekennzeichnet, dass er Folgendes umfasst:
    Mittel zum automatischen Speichern einer gegenwärtig offenen Anwendung in einem Cache-Speicher, wenn die Signalstärke unterhalb einer zweiten Schwelle liegt, wobei die zweite Schwelle niedriger als die erste Schwelle ist.
  2. Drahtloses lokales Netzwerk nach Anspruch 1, wobei:
    das Kontrollgerät für die Wahrscheinlichkeit eines Verlusts der Verbindung sich innerhalb eines Netzwerk-Zugangspunkts befindet.
  3. Drahtloses lokales Netzwerk nach Anspruch 1, wobei:
    das Kontrollgerät für die Wahrscheinlichkeit eines Verlusts der Verbindung ortsgleich mit dem Benutzergerät ist.
  4. Drahtloses lokales Netzwerk nach Anspruch 1, wobei:
    der Verkünder eine Leuchtdiode umfasst.
  5. Drahtloses lokales Netzwerk nach Anspruch 1, wobei
    der Verkünder eine Anzeige umfasst.
  6. Drahtloses lokales Netzwerk nach Anspruch 1, wobei:
    der Verkünder einen Lautsprecher umfasst.
  7. Schnittstellenkarte (34) für ein drahtloses Netzwerk zum Einstecken in ein Benutzergerät (32), die Folgendes umfasst:
    ein Kontrollgerät (56) für die Wahrscheinlichkeit eines Verlusts der Verbindung zum Bestimmen, ob eine hohe Wahrscheinlichkeit besteht, dass das Benutzergerät eine drahtlose Netzwerkverbindung verliert, wenn bestimmt wird, dass eine der drahtlosen Verbindung zugehörige Signalstärke unterhalb einer ersten Schwelle liegt;
    Mittel (56) zum Bewirken, dass einem Benutzer des Benutzergeräts eine Benachrichtigung bereitgestellt wird, wenn das Kontrollgerät für die Wahrscheinlichkeit eines Verlusts der Verbindung bestimmt, dass eine hohe Wahrscheinlichkeit für den Verlust der drahtlosen Netzwerkverbindung besteht; dadurch gekennzeichnet, dass sie Folgendes umfassen:
    Mittel zum automatischen Speichern einer gegenwärtig offenen Anwendung in einem Cache-Speicher, wenn bestimmt wird, dass die Signalstärke unterhalb einer zweiten Schwelle liegt, wobei die zweite Schwelle niedriger ist als die erste Schwelle.
  8. Schnittstellenkarte für ein drahtloses Netzwerk nach Anspruch 7, wobei:
    das Mittel zum Bewirken, dass eine Benachrichtigung bereitgestellt wird, Mittel zum Steuern eines Anzeigers auf der Netzwerk-Schnittstellenkarte auf der Grundlage einer Bestimmung des Kontrollgeräts für die Wahrscheinlichkeit des Verlusts der Verbindung umfasst.
  9. Schnittstellenkarte für ein drahtloses Netzwerk nach Anspruch 7, wobei:
    das Mittel zum Bewirken, dass eine Benachrichtigung bereitgestellt wird, Mittel zum Verursachen einer Warnmeldung umfasst, die auf einer Anzeige des Benutzergeräts anzuzeigen ist.
  10. Schnittstellenkarte für ein drahtloses Netzwerk nach Anspruch 7, wobei
    das Mittel zum Bewirken, dass eine Benachrichtigung bereitgestellt wird, Mittel zum Verursachen einer akustischen Warnung umfasst, die auf einem Lautsprecher des Benutzergeräts auszugeben ist.
  11. Verfahren zur Verwendung innerhalb eines lokalen Netzwerks, das Folgendes umfasst:
    Bestimmen (84), ob eine hohe Wahrscheinlichkeit dafür besteht, dass ein Benutzergerät im drahtlosen lokalen Netzwerk eine drahtlose Netzwerkverbindung verlieren wird, wenn bestimmt wird, dass eine der drahtlosen Verbindung zugehörige Signalstärke unterhalb einer ersten Schwelle liegt;
    Benachrichtigen (90, 92, 94) eines Benutzers des Benutzergeräts, wenn bestimmt wird, dass eine erhöhte Wahrscheinlichkeit besteht, dass das Benutzergerät die drahtlose Netzwerkverbindung verlieren wird; dadurch gekennzeichnet, dass:
    die gegenwärtig offene Anwendung automatisch in einem Cache-Speicher gespeichert (88, 98) wird, wenn bestimmt wird, dass die Signalstärke unterhalb einer zweiten Schwelle liegt, wobei die zweite Schwelle niedriger ist als die erste Schwelle.
  12. Verfahren nach Anspruch 11, wobei:
    das Bestimmen ferner das Bestimmen umfasst, ob das Signal bei einer Rate abnimmt, die größer als eine vorbestimmte Rate ist.
  13. Verfahren nach Anspruch 11, wobei
    das Bestimmen ferner das Bestimmen umfasst, ob eine dem die drahtlose Netzwerkverbindung unterstützenden drahtlosen Kommunikationskanal zugehörige Fehlerrate größer als eine vorbestimmte Fehlerrate ist.
  14. Schnittstellenkarte für ein drahtloses Netzwerk nach Anspruch 7, die ferner Folgendes umfasst:
    eine Steuereinheit, wobei:
    die Steuereinheit angepasst ist, um das Bereitstellen einer Benachrichtigung für einen Benutzer des Benutzergeräts zu bewirken, wenn bestimmt wird, dass eine einem drahtlosen Kommunikationskanal zwischen der Schnittstellenkarte des drahtlosen Netzwerks und einem Zugangspunkt eines entfernten Netzwerks zugehörige Signalstärke unterhalb einer ersten Schwelle liegt; und
    die Steuereinheit angepasst ist, um eine gegenwärtig offene Anwendung automatisch in den Cache-Speicher zu speichern, wenn bestimmt wird, dass die Signalstärke unterhalb einer zweiten Schwelle liegt, wobei die zweite Schwelle niedriger als die erste Schwelle ist.
  15. Schnittstellenkarte für ein drahtloses Netzwerk nach Anspruch 14, die Folgendes umfasst:
    ein Signalstärken-Kontrollgerät zum Überwachen einer Stärke von Signalen, die über den drahtlosen Kommunikationskanal vom Zugangspunkt des entfernten Netzwerks empfangen werden, wobei die Steuereinheit Signalstärkeninformationen vom Signalstärken-Kontrollgerät zur Verwendung bei der Bestimmung, ob der Benutzer zu benachrichtigen ist, erhält.
  16. Schnittstellenkarte für ein drahtloses Netzwerk nach Anspruch 14, wobei:
    die Steuereinheit Signalstärkeninformationen vom Zugangspunkt des entfernten Netzwerks zur Verwendung bei der Bestimmung, ob der Benutzer zu benachrichtigen ist, erhält.
  17. Schnittstellenkarte für ein drahtloses Netzwerk nach Anspruch 16, wobei:
    die Steuereinheit eine Signalstärken-Anforderungsnachricht zur Sendung an den Zugangspunkt des entfernten Netzwerks erzeugt, um die Signalstärkeninformationen anzufordern.
  18. Schnittstellenkarte für ein drahtloses Netzwerk nach Anspruch 14, wobei:
    die Steuereinheit bewirkt, dass eine Benachrichtigung für den Benutzer bereitgestellt wird, indem die Anzeige einer Warnmeldung auf einer dem Benutzergerät zugehörigen Anzeige verursacht wird.
  19. Schnittstellenkarte für ein drahtloses Netzwerk nach Anspruch 18, wobei:
    die Warnmeldung eine Anzahl von Antwortauswahlmöglichkeiten für den Benutzer darstellt, von denen der Benutzer auswählen kann.
  20. Schnittstellenkarte für ein drahtloses Netzwerk nach Anspruch 19, wobei:
    die Warnmeldung eine Antwortauswahlmöglichkeit zum Speichern eines der gegenwärtigen offenen Anwendung zugehörigen Anwendungszustands in einem lokalen Cache-Speicher umfasst.
  21. Schnittstellenkarte für ein drahtloses Netzwerk nach Anspruch 19, wobei:
    die Warnmeldung eine Antwortauswahlmöglichkeit zum Suchen nach einem alternativen Zugangspunkt umfasst.
  22. Schnittstellenkarte für ein drahtloses Netzwerk nach Anspruch 14, wobei:
    die Steuereinheit bewirkt, dass dem Benutzer eine Benachrichtigung bereitgestellt wird, indem ein optischer Anzeiger auf einer Außenfläche der Schnittstellenkarte für das drahtlose Netzwerk auf zweckmäßige Weise gesteuert wird.
  23. Schnittstellenkarte für ein drahtloses Netzwerk nach Anspruch 14, wobei:
    die Steuereinheit bewirkt, dass dem Benutzer die Benachrichtigung bereitgestellt wird, indem sie das Ausgeben eines akustischen Signals von einem dem Benutzergerät zugehörigen Lautsprecher bewirkt.
  24. Schnittstellenkarte für ein drahtloses Netzwerk nach Anspruch 14, wobei:
    der vorbestimmte Bereich einen Bereich zwischen einer ersten vorbestimmten Signalstärke und Null umfasst.
  25. Drahtloser Zugangspunkt (30), der eingerichtet ist, um für ein Benutzergerät einen drahtlosen Zugang zu einem lokalen Netzwerk bereitzustellen, und der Folgendes umfasst:
    einen Empfänger (44) zum Empfangen von Signalen vom Benutzergerät;
    ein Signalstärken-Kontrollgerät (46) zum Überwachen der Stärke der vom Benutzergerät empfangenen Signale; dadurch gekennzeichnet, dass es Folgendes umfasst:
    eine Steuereinheit (48) zum Erzeugen eines Signalstärken-Antwortsignals zur Lieferung an das Benutzergerät, wenn ein Signalstärken-Anforderungssignal vom Benutzergerät empfangen wird, wobei das Signalstärken-Anforderungssignal Signalstärkeninformationen zur Verwendung bei der Bestimmung von Folgendem anfordert:
    i) ob ein dem Benutzergerät zugehöriger Benutzer über einen möglichen Verlust der Verbindung mit dem lokalen Netzwerk zu benachrichtigen ist, wenn bestimmt wird, dass die Signalstärkeninformationen unterhalb einer ersten Schwelle liegen, oder
    ii) ob eine gegenwärtig offene Anwendung automatisch in einem Cache-Speicher zu speichern ist, wenn bestimmt wird, dass die Signalstärke unterhalb einer zweiten Schwelle liegt, wobei die zweite Schwelle niedriger als die erste Schwelle ist,
    die Steuereinheit (48) zum Erzeugen des Signalstärken-Antwortsignals auf der Grundlage der von dem Signalstärken-Kontrollgerät (46) ausgegebenen Informationen.
  26. Drahtloser Zugangspunkt nach Anspruch 25, der Folgendes umfasst:
    mindestens einen zusätzlichen Empfänger zum Empfangen von drahtlosen Kommunikationssignalen von mindestens einem anderen Benutzergerät.
  27. Drahtloser Zugangspunkt nach Anspruch 26, der Folgendes umfasst:
    mindestens ein zusätzliches Signalstärken-Kontrollgerät zum Überwachen der Stärke von drahtlosen Kommunikationssignalen, die von dem mindestens einen anderen Benutzergerät empfangen werden.
  28. Drahtloser Zugangspunkt nach Anspruch 26, wobei:
    die Steuereinheit eine Leistungssteuerungsfunktion zum Erzeugen einer Leistungssteuerungsnachricht zur Lieferung an das Benutzergerät umfasst, die das Benutzergerät anweist, seine Sendeleistung einzustellen, wobei die Leistungssteuerungsnachricht sich von dem Signalstärken-Antwortsignal unterscheidet.
  29. Verfahren nach Anspruch 11, wobei
    das Bestimmen das Erhalten von Signalstärkeninformationen umfasst, die den drahtlosen Kommunikationskanal zwischen dem Benutzergerät und einem NetzwerkZugangspunkt betreffen, wobei der Netzwerkzugangspunkt dem Benutzergerät Zugang zum lokalen Netzwerk bereitstellt.
  30. Verfahren nach Anspruch 29, wobei:
    das Erhalten der Signalstärkeninformation das Senden einer Signalstärken-Anforderungsnachricht an den Netzwerk-Zugangspunkt über den drahtlosen Kommunikationskanal und das Empfangen einer Signalstärken-Antwortnachricht vom Netzwerkzugangspunkt in Reaktion darauf umfasst, wobei die Signalstärken-Antwortnachricht die Signalstärkeninformationen umfasst.
  31. Verfahren nach Anspruch 29, wobei:
    das Erhalten der Signalstärkeninformationen das Erfassen eines Ausgangssignals eines Signalstärken-Kontrollgeräts, das beim Benutzergerät untergebracht ist, umfasst.
  32. Verfahren nach Anspruch 29, wobei:
    das Benachrichtigen des Benutzers das zweckmäßige Steuern eines dem Benutzergerät zugehörigen externen Anzeigers umfasst.
  33. Verfahren nach Anspruch 29, wobei:
    das Benachrichtigen des Benutzers das Bewirken der Anzeige einer Warnmeldung auf einer dem Benutzergerät zugehörigen Anzeige umfasst.
  34. Verfahren nach Anspruch 33, wobei:
    die Warnmeldung für den Benutzer eine Anzahl von Antwortauswahlmöglichkeiten zur Auswahl durch den Benutzer darstellt.
  35. Verfahren nach Anspruch 29, wobei:
    das Benachrichtigen des Benutzers das Verursachen eines vom Benutzergerät auszugebenden akustischen Signals bewirkt.
EP03718489A 2002-04-22 2003-04-17 Vorbenachrichtigung von möglichen verlust der verbindung in einem drahtloses locales netzwerk Expired - Lifetime EP1500230B1 (de)

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EP1500230A1 (de) 2005-01-26
HK1071248A1 (en) 2005-07-08
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